[#10] Fix: login도 ajax로 통신하는 것을 고려하여 @RequestBody로 변경

- 로그인도 /api로 제공하는 경우, 데이터가 json으로 전달되는 것을 고려하여 @RequestBody로 변경함.
- 객체가 비밀번호를 확인하도록 구현

BE/src/main/java/com/codesquad/team1/signup/controller/ApiUserController.java

@@ -47,13 +47,13 @@ public User createUser(@RequestBody User user) {
     }
 
     @PostMapping("/login")
-    public boolean login(@RequestParam String userId, @RequestParam String password, HttpSession session) {
-        Optional<User> optionalUser = userRepository.findByUserId(userId);
+    public boolean login(@RequestBody User loginUser, HttpSession session) {
+        Optional<User> optionalUser = userRepository.findByUserId(loginUser.getUserId());
         if (!optionalUser.isPresent())
             return false;
 
         User user = optionalUser.get();
-        if (!user.matchPassword(password))
+        if (!user.matchPassword(loginUser))
             return false;
 
         session.setAttribute(SESSION_USER_KEY, user);

BE/src/main/java/com/codesquad/team1/signup/repository/User.java

@@ -93,7 +93,7 @@ public boolean validate() {
         return idMatcher.matches() && passwordMatcher.matches() && emailMatcher.matches() && phoneNumberMatcher.matches();
     }
 
-    public boolean matchPassword(String password) {
-        return this.password.equals(password);
+    public boolean matchPassword(User loginUser) {
+        return this.password.equals(loginUser.password);
     }
 }